/*
 * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
 *
 * This file is part of Spydroid (http://code.google.com/p/spydroid-ipcamera/)
 *
 * Spydroid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package net.majorkernelpanic.screening.hw;

import android.annotation.SuppressLint;
import android.media.MediaCodecInfo;
import android.media.MediaCodecList;
import android.util.Log;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;

@SuppressLint("InlinedApi")
public class CodecManager {

  public final static String TAG = "CodecManager";

  public static final int[] SUPPORTED_COLOR_FORMATS = {
    MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420SemiPlanar,
    MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420PackedSemiPlanar,
    MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar,
    MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420PackedPlanar,
    MediaCodecInfo.CodecCapabilities.COLOR_TI_FormatYUV420PackedSemiPlanar
  };

  private static Codec[] sEncoders = null;
  private static Codec[] sDecoders = null;

  static class Codec {
    public Codec(String name, Integer[] formats) {
      this.name = name;
      this.formats = formats;
    }
    public String name;
    public Integer[] formats;
  }

  /**
   * Lists all encoders that claim to support a color format that we know how to use.
   * @return A list of those encoders
   */
  @SuppressLint("NewApi")
  public synchronized static Codec[] findEncodersForMimeType(String mimeType) {
    if (sEncoders != null) return sEncoders;

    ArrayList<Codec> encoders = new ArrayList<Codec>();

    // We loop through the encoders, apparently this can take up to a sec (testes on a GS3)
    for(int j = MediaCodecList.getCodecCount() - 1; j >= 0; j--){
      MediaCodecInfo codecInfo = MediaCodecList.getCodecInfoAt(j);
      if (!codecInfo.isEncoder()) continue;

      String[] types = codecInfo.getSupportedTypes();
      for (int i = 0; i < types.length; i++) {
        if (types[i].equalsIgnoreCase(mimeType)) {
          try {
            MediaCodecInfo.CodecCapabilities capabilities = codecInfo.getCapabilitiesForType(mimeType);
            Set<Integer> formats = new HashSet<Integer>();

            // And through the color formats supported
            for (int k = 0; k < capabilities.colorFormats.length; k++) {
              int format = capabilities.colorFormats[k];

              for (int l=0;l<SUPPORTED_COLOR_FORMATS.length;l++) {
                if (format == SUPPORTED_COLOR_FORMATS[l]) {
                  formats.add(format);
                }
              }
            }

            Codec codec = new Codec(codecInfo.getName(), (Integer[]) formats.toArray(new Integer[formats.size()]));
            encoders.add(codec);
          } catch (Exception e) {
            Log.wtf(TAG,e);
          }
        }
      }
    }

    sEncoders = (Codec[]) encoders.toArray(new Codec[encoders.size()]);
    return sEncoders;
  }

  /**
   * Lists all decoders that claim to support a color format that we know how to use.
   * @return A list of those decoders
   */
  @SuppressLint("NewApi")
  public synchronized static Codec[] findDecodersForMimeType(String mimeType) {
    if (sDecoders != null) return sDecoders;
    ArrayList<Codec> decoders = new ArrayList<Codec>();

    // We loop through the decoders, apparently this can take up to a sec (testes on a GS3)
    for(int j = MediaCodecList.getCodecCount() - 1; j >= 0; j--){
      MediaCodecInfo codecInfo = MediaCodecList.getCodecInfoAt(j);
      if (codecInfo.isEncoder()) continue;

      String[] types = codecInfo.getSupportedTypes();
      for (int i = 0; i < types.length; i++) {
        if (types[i].equalsIgnoreCase(mimeType)) {
          try {
            MediaCodecInfo.CodecCapabilities capabilities = codecInfo.getCapabilitiesForType(mimeType);
            Set<Integer> formats = new HashSet<Integer>();

            // And through the color formats supported
            for (int k = 0; k < capabilities.colorFormats.length; k++) {
              int format = capabilities.colorFormats[k];

              for (int l=0;l<SUPPORTED_COLOR_FORMATS.length;l++) {
                if (format == SUPPORTED_COLOR_FORMATS[l]) {
                  formats.add(format);
                }
              }
            }

            Codec codec = new Codec(codecInfo.getName(), (Integer[]) formats.toArray(new Integer[formats.size()]));
            decoders.add(codec);
          } catch (Exception e) {
            Log.wtf(TAG,e);
          }
        }
      }
    }

    sDecoders = (Codec[]) decoders.toArray(new Codec[decoders.size()]);

    // We will use the decoder from google first, it seems to work properly on many phones
    for (int i=0;i<sDecoders.length;i++) {
      if (sDecoders[i].name.equalsIgnoreCase("omx.google.h264.decoder")) {
        Codec codec = sDecoders[0];
        sDecoders[0] = sDecoders[i];
        sDecoders[i] = codec;
      }
    }

    return sDecoders;
  }
}
